Dugesia umbonata, holotype PLA-0151, sagittal sections and reconstructions of the copulatory apparatus. A. photomicrograph showing copulatory bursa, bursal canal, hump and seminal vesicle; B. photomicrograph showing copulatory bursa, seminal vesicle, ejaculatory duct, diaphragm, penis, male atrium, common atrium and gonopore; C. photomicrograph showing copulatory bursa, ejaculatory duct, penis papilla and male atrium; D. reconstruction male copulatory apparatus; E. reconstruction female copulatory apparatus.